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When is “L” doubled?

Is there any guidance on the usage of doubled consonants, particularly L, in British versus US English? For example 'Travelled' v. 'Traveled', 'Cancelled' v. 'Canceled', but then 'Enrolment' v. 'Enrollment'. Then there's 'Travelling' v. 'Traveling' etc.

In each case I've put what I consider to be the British standard first.

Just wondering if there's any consistency, for example 'in present and past participles ending in L the British usage is to add a second L'?

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marked as duplicate by Mehper C. Palavuzlar, Mr. Shiny and New 安宇, aedia λ, Peter Shor , Matt E. Эллен Nov 15 '11 at 15:35

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

related: "Cancelled" or "Canceled" – Matt E. Эллен Nov 15 '11 at 14:00

One good way to resolve this issue is to use Google ngrams. It isn't perfect but it can give you a good approximation.

Example: Cancelled vs canceled (British) enter image description here

Cancelled vs canceled (American) enter image description here

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The American rule is to double the 'l' if the last syllable is accented when you add the suffix -ing or -ed, but not if the first syllable is accented. The British rule is to always double the 'l'. This explains most of the differences: traveled, canceled, fueled and so on. (Both sides of the pond double the 'l' in words like propelled where the stress is on the second syllable.)

The word enroll/enrol (note that the spelling difference appears in the base word as well as in the derived enrollment/enrolment) is not part of this pattern, but just an isolated spelling difference that confuses the issue.

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You don't accent the 2nd syllable in enroll? – Mr. Shiny and New 安宇 Nov 15 '11 at 13:45
Thanks for that explanation. Is L the only consonant this rule applies to? I'm thinking of verbs ending in 'er' for example (although ones I can think of at the moment are stressed on the 'er', such as prefer). – Joe Fawcett Nov 15 '11 at 14:18
@Mr.ShinyandNew安宇 - Actually, I don't think I do. However, I personally don't believe in English spelling "rules", much like I don't believe in the Tooth Fairy. – T.E.D. Nov 15 '11 at 14:42
Hmm, that's at least coherent. When I was in school -- in the US -- I was taught that you always doubled the final consonant when adding "-ing" or "-ed". But this is apparently not the correct rule. I've struggled with this for decades. – Jay Nov 15 '11 at 20:07
@Jay: this is definitely the American rule, and I think it holds for all consonants except 'c'. Of course, there are exceptions (e.g. programmed). – Peter Shor Nov 15 '11 at 21:50

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